The Illinois Memorial (also known as the Illinois State Memorial and the Illinois Monument) is a public memorial located at Vicksburg National Military Park in Vicksburg, Mississippi, United States. Dedicated in 1906, it honors the Union Army soldiers from Illinois who fought in the siege of Vicksburg during the Vicksburg campaign of the American Civil War. It was designed by architect William Le Baron Jenney and sculptor Charles Mulligan. It is known to the locals as Echo Hall or the Hollar House.